Patents Assigned to Spemens AG
  • Patent number: 6322849
    Abstract: An integrated circuit is formed containing a metal-oxide ferroelectric thin film. An inert-gas recovery anneal is conducted to reverse the degradation of ferroelectric properties caused by hydrogen. The inert-gas recovery anneal is conducted in an unreactive gas atmosphere at a temperature range from 300° to 1000° C. for a time period from one minute to two hours. Preferably, the metal-oxide thin film comprises layered superlattice material. Preferably, the layered superlattice material comprises strontium bismuth tantalate or strontium bismuth tantalum niobate. If the integrated circuit manufacture includes a forming-gas anneal, then the inert-gas recovery anneal is performed after the forming-gas anneal, preferably at or near the same temperature and for the same time duration as the forming-gas anneal.
    Type: Grant
    Filed: November 13, 1998
    Date of Patent: November 27, 2001
    Assignees: Symetrix Corporation, Spemens AG
    Inventors: Vikram Joshi, Narayan Solayappan, Walter Hartner, Günther Schindler